3 namespace Drupal\form_test\Form;
5 use Drupal\Core\Form\FormBase;
6 use Drupal\Core\Form\FormStateInterface;
9 * Form constructor to test the #required property.
13 class FormTestValidateRequiredForm extends FormBase {
18 public function getFormId() {
19 return 'form_test_validate_required_form';
25 public function buildForm(array $form, FormStateInterface $form_state) {
26 $options = ['foo' => 'foo', 'bar' => 'bar'];
27 $validate = ['::elementValidateRequired'];
29 $form['textfield'] = [
30 '#type' => 'textfield',
33 '#required_error' => t('Please enter a name.'),
35 $form['checkboxes'] = [
36 '#type' => 'checkboxes',
37 '#title' => 'Checkboxes',
38 '#options' => $options,
40 '#form_test_required_error' => t('Please choose at least one option.'),
41 '#element_validate' => $validate,
46 '#options' => $options,
48 '#form_test_required_error' => t('Please select something.'),
49 '#element_validate' => $validate,
54 '#options' => $options,
57 $form['radios_optional'] = [
59 '#title' => 'Radios (optional)',
60 '#options' => $options,
62 $form['radios_optional_default_value_false'] = [
64 '#title' => 'Radios (optional, with a default value of FALSE)',
65 '#options' => $options,
66 '#default_value' => FALSE,
68 $form['actions'] = ['#type' => 'actions'];
69 $form['actions']['submit'] = ['#type' => 'submit', '#value' => 'Submit'];
76 public function elementValidateRequired($element, FormStateInterface $form_state) {
77 // Set a custom validation error on the #required element.
78 if (!empty($element['#required_but_empty']) && isset($element['#form_test_required_error'])) {
79 $form_state->setError($element, $element['#form_test_required_error']);
86 public function submitForm(array &$form, FormStateInterface $form_state) {
87 $this->messenger()->addStatus('The form_test_validate_required_form form was submitted successfully.');